Pulley-block



(NoMOdeL) D. M. GARRETT PULLBY BLOCK. No. 297,128.

Patented Apr. 22, 1884.

MAM

um/J00 N. PEI'ERS, Pholoilmngnphar, Washington. olc.

ITE -TATES DANIEL M. GARRETT, OF BOSTON, MASSACHUSETTS,- ASSIGNOR TO THEWHITMAN & BARNES MANUFACTURING COMPANY, OF AKRON, OHIO.-

PU LLEY-B LOG K.

SPECIFICATION forming part of Letters Patent No. 297,128, dated April22, 1884. Application filed January 19, 1884. (No model.)

To all whom it may concern:

Be it known that I, DANIEL M. GARRETT, a citizen of the United States,residing at Boston, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements inPulleyBlocks; and I do hereby declare that the same are fully describedin the following specification, and illustrated in the accompanyingdrawings.

This invention relates to improvements in pulley-blocks; and it iscarried out as follows, reference being had to the accompanyingdrawings, wl1ere Figure 1 represents a side elevation of the improvedblock. Fig. 2 represents a plan view of it. Fig. 3 represents alongitudinal section on the line A B shown in Fig. 1. Fig. 4 representsa horizontal section on the line C D shown in Fig. 1, and Fig. 5represents a modified form of the rawhide bushing for the pulley.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

a a represent the sides of the block, such sides being made ofmetal-cast, rolled, or forgedor of wood, as may be desired.

1) represents thepulley, made of wood or metal, and provided centrallywith afemale screwthread, b, as shown in Fig. 3, into which is driventhe rawhide washers c c c, thelatter being cemented together andcompressed into the central screw-threaded or corrugated recess in thepulley b, and adapted to serve as an antifrictional bearing forthespindle d, that passes through the side pieces, a a, and centralperforation in the rawhide bearing 0 c, as shown in said Fig. 3. Iprefer to bore out or otherwise make the central perforation in thepulley b with a helical screw-thread, as above described, in the groovesof which the rawhide washers c c are forced; but it is not essentialthat a femalescrewthread shouldbecut ormade in said pulley b, as I mayto equal advantage make the hole in the center of said pulley with anumber of parallel annular grooves and projections, or provide thecircumference of such perforation with a number of projections orequivalent device for retaining in place the cemented rawhide washersdriven into such central perforation. The rawhide washers o 0 may bebored out or otherwise perforated before or after being driven into thecentral perforation of pulley b, for the reception of spindle d, asshown in Fig. 3.

In Fig. 5 is shown a modified form of the anti-frictional rawhidejournal for spindle (2, such modification consisting in molding orpressing a piece of rawhide into a cylindrical shape,which cylinder isafterward driven into the central perforation of pulley b as anequivalent for the cemented rawhide washers c c 0 shown in Fig. 3.

In their lower ends the side pieces, a a, are united at a properdistance apart by means of metal or wooden stays, or end pieces, ee,riveted. or otherwise secured to the respective sides a a in any of theordinary'ways, as may be desirable.

The manner of securing the hook to the upper end of the block forms animportant feature of my invention, and it is carried out as follows: Theupper end piece that connects the sides a a is made in two halves, f f,united at the meeting-edge f, as shown in Figs. 2 and 4:, by means ofrivets g g g g, passing through tubular proj ections f f and the sides aa, and riveted on the outside of the latter,as shown. I prefer to makethe ends f f with tubular projections f f, so as to make the said ends ff as light as possible, combined with proper strength.

It is the hook, and h is its shank, terminating in its lower end as ahead or annular projection, h, that is forged in one solid piece withtheshank it of said hook, as shown in Fig. 3, and not provided with aloose head or collar riveted to it, as is common on ordinary kinds ofblocks. That portion of the hook directly above the shank h is of evensize with it, and not provided with an enlargement or collar common onriveted hooks, and by this construction of the hook with its solid headh, I

am able to make it very strong and durable,

and in this manner prevent any accident caused by the breaking of theordinary riveted head or collar. Thehook,as constructed,being with outany collar or enlargement immediately above its shank, can bemanufactured much cheaper than ordinary pulley-hooks. The hub ing aroundin its bearing.

or central portion of each of the halves ff has an internal semi-annulargroove or recess, f", adapted to receive the head h of the hook, asshown in Fig. 3, such semi-annular grooves terminating below the head has semi-annular flanges f f, that serve to prevent the hook shank frommoving vertically within its bear- 1ng.

It is often desirable to lock the hook to its block in such a manner asto prevent the shank of the hook from turning around in its bearing, andfor this purpose I provide the hub of the halves f f with one or moreinternal vertical grooves, j'fland I make one or more similar grooves,h, on the shank h of the hook,as shown in Figs. 3 and 4, by means ofwhich and a suitable locking-pin, i, inserted in one of thecorresponding grooves, f 5 and h", the hook will be locked to the blockand prevented from turn- As an equivalent locking device for the purposeabove named, may be used aset-screw, passing through one of the sides ofthe block and having its inner end adapted to rest in a recess on theside of the shank of the hook, or in other equivalent manner, withoutdeparting from the essence of my invention.

lVh at I wish to seed re by Letters Patent and claim is 1. The pulleyb,having a central screw-threadedore uivalent erforatiomb incombinationI with the perforated rawhide washers c c, ce- I mented together andsecured within the said perforation I), in a manner substantially asherein set forth and described.

2. In a pulley-block, the upper end piece made in two halves, ff,secured to sides a a, and having semi-annular internal grooves, f f'*,and fiangesf ffladapted to retain in position the shank h and head h ofthe hook h, as set forth.

3. In a pulley-block, the hook h, its shank h,and lower annular head,h,all made in one continuous solid piece, combined with an end piece forsecuring such hook, said end piece being made in two halves, f f,riveted to sides a a, as set forth.

4. The end piece for holding the hook in a pulley-block,as described,made in two halves, f f, provided with tubular projections f f, andsecured to sides a a by means of rivets g g, as and for the purpose setforth.

5. In a pulley-block, one or more grooves, f 71., in the respectivebearing and shank for the hook, combined with detachable lockingpin z,orequivalent locking device for locking the hook to its block, as and forthe purpose set forth.

In testimony whereof I have affixed my signature in presence of twowitnesses.

DANIEL M. GARRETT.

I'Vitnesses:

ALBAN ANDREN, .MIOIIAEL B. GILBRIDE.

